Grinding-machine.



No. 880,188. PATENTED FEB, 25, 1908. J. G. BLESSING.

GRINDING MACHINE.

APPLICATION FILED 00T. 15, 190a; RENEWED DEC. 9, 1907.

4 SHEETS-SHEET 1.

PATBNTED FEB. 25, 1908.

4 SHEETS-SHEET 2.

NM MN E I H f 472 QfiZesJ J. G. BLESSING. GRINDING MACHINE.

APPLICATION FILED 001215, 1906. RENEWED DEC. 9, 1907 @1- m if, n

Q mm UIIIIIIH l-unm No. 880,188. PATENTED FEB. 25,1908. J. G. BLESSING.

GRINDING MACHINE.

PPPPPPPPPPPPPPPPP 0T.15, 190s. RENEWED Mo. 9. 1901.

J. G. BLESSING.

GRINDING MACHINE.

' APPLICATION rum) 001215, 1906. RENEWED DEC. 9, 1907.

4 SHEETS-SHEET 4.

I No. 880,188. PATBNTED FEB. 25, 1908.

UNITED STATES PATENT OFFICE.

JOHN G. BLESSING, OF CHICAGO, ILLINOIS, ASSIGNOB TO AMERICAN GUTLERY COMPANY, OF CHICAGO, ILLINOIS.

GRINDING-MACHINE Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed October 15. 1906 Serial No. 338.932- Renewed December 9.1907- Serial No. 405.783.

To all whom it may concern:

Be it known that I, JOHN G. BLESSING, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Grinding-Machines, of which the following is a specification.

My invention relates to improvements in cutlery grinding machines, more especially of, the class in which the grinding is performed in a single reciprocation of the work carrier.

My present invention is in the nature of an improvement upon the construction shown, described, and claimed in an application filed by me April 17, 1906, and bearing Serial Number 312,112.

In its general construction and operation the present machine is very similar to that shown in my former application referred to; and my present object is to provide certain improvements in the construction of the fluid-pressure motordevice which reciprocates the work-carrier, and in the means for swinging the carrier laterally to move the work into and out of engagement with the grinding-wheel, all to the end of adapting the machine more perfectly toits purpose.

Referring to the accompanying drawings, Figure 1 is a broken top plan view of a knifeblade grinding machine constructed with my improved motor and carrier swinging mechanism; Fig. 2, an enlarged broken fragmentary view in side elevation of the fluid-pressure motor Fig. 3, a broken longitudinal section of the same Fig. 4, an end view of the motor Figs. 5 and 6, sections taken respectively on lines 5 and 6 in Fig. 3, and viewed in the direction of the arrows; Fig. 7, a broken, partly sectional, view showing in side elevation, mechanism for shifting the motor-valve to reverse the movement of the work-carrier, as well as means for moving the reciprocating work-carrier laterally with relation to the grinding-wheel Figs. 8 and 9, views the same as Fig. 7, but showing the moving parts in different positions; and Fig. 10, an enlarged and broken fragmentary view showing the connection between the motor-starting lever and the motor-reversing valve.

The main frame of the machine is formed at its upper side with a water receptacle or basin 11 in which the usual hollow cylindrical grinding-wheel 12 rotates. The grindingwheel has an inwardly-tapering annular grinding surface 13 and rotates constantly.

14 is a horizontal base-plate adjustably pivoted at 15 to the main frame 11 to swing on its pivot to a limited extent toward and away from the grinding wheel. Secured upon the plate 14 are perforated lugs 16, 17, forming guides for a longitudinally movable rod 18. Parallel with the rod 18 is a station ary guide rod 19 mounted at opposite ends in lugs 20 and 21 rising from the plate 14.

22 is a work-holder carrier extending parallel with the rods 18, 19, having a flanged end portion 23 receiving and fastened to the rod 18 and terminating at its opposite end in a cross-head 24 having openings through which the rods 18, 19 pass. The cross-head slides freely uponthe guide-rod 19. Secured upon the plate 14, in the positions shown, are heads 25 and 26 for a cylinder 27; and extending through the heads, above the cylinder, is a tube or valve-chamber 28 closed at one end and provided at its opposite end with a stuffingbox 29. Extending through the stufiingbox and working in the valve-chamber 28 is a valve-rod 30 provided with pistons 31 and 32 in the relative positions shown. Extending into the tube 28, between the pistons 31, 32, is a fluid-pressure supply-passage 33 connected in practice by a rubber hose, or the like, with a fluid-pressure supplier, not shown. In the head 25 is a port 34 affording communication between the interior of the tube 28 and interior of the cylinder 27 at one end. Adjacent to the port 34 is a port 35 cored in the head 25 and communicating at one end with the interior of the tube 28 and at its opposite end with a ipe 36 extending, parallel with the lower si e of the cylinder, through the head 26, beyond which it is PI'O? vided with a cock or faucet 37 provided with a rotary plug-valve 38. In the head 26 are a cored passage or port 39, communicating at one end with the interior of the tube 28 and at its opposite end with the cylinder 27, and a port or passage 40 extending from the interior of the tube 28 to a pipe 41 provided with a cook or faucet 42 having a rotary plug valve 43.

44 is an operating lever or handle pivoted at 45 upon the stationary lug 16 and pivotally connected between its ends, as shown in Fig. 10, to a link 46 extending from a head 47 on the stem 30. Surrounding the said stem and confined between the stuffing-box 29 and head 47 is a spring 48 which tends normally .to shift the stem and its pistons 31 and 32 in the direction to the right in Figs. 1, 2, and 3. Working in the cylinder 27 is a iston 49 on a stem 50 passing through a stu mg-boX 51 in the head 26 and secured at its outer end to the cross-head 24. j

The pistons 31 and 32 are in effect slidevalves', which, in the sliding of the stem 30, open and close the end ports in the tube or valve-chamber 28. When in the positions shown in Fig. 3, the valves 31 and 32 openthe port 3.4 to the tube, close the port 35, and 0 en the passage from the cylinder through t e ports 39 and 40 to the faucet 42. hen in this position, motive fluid passes from the port 33 through the tube and port 34 to the cylinder todrive the piston 49 in the direction of the head 26, the fluid in advance of the. piston escaping. through the faucet 42. Movement of the stem 30 to the right, until thevalve 32 coversthe port 40, opens the passage 39 to admit the motive fluid into thatv end of the cylinder and opens the passage through the ports 34, 35 for the escape of fluid from the cylinder therethrough and through, the pipe 36 to the faucet 37, whereby thepiston 49 will be moved to the left. The piston 49, through its stem 50, moves the cross-head 24 and work-holder carrier 22 longitudinally with the guide-rod 18, while sliding upon the guide-rod 19.

The carrier 22. carries an adjustable workholder bar 52 of the construction shown and described in my aforesaid pending application. It will suffice to say that the bar is adapted to receive and hold a knife-blade 53 placed against its face.

The handle 44, in its movement slides u on a bar 54, the bar being mounted upon the ug 2.0. The tendency of the spring 48 is to move. the stem 30 until the piston or valve 32 covers the port 40 and the handle 44' contacts with the stop 55. This is the normal position of the parts, and the piston 49 comesto rest in the position shown in Fig. 3. The operation of the reciprocating work-carrier is started by moving the handle 44 to the stop 56., and means are provided for permitting the s ring 48 to reverse the valves 31 and 32 and t e movement of the piston 49 when the latter reaches the limit of its movement in the direction of the head 26. These means will be next described.

Beneath. the guide-bar 19 is a rod 57 which slides longitudinally in guide openings in the lugs 20 and 21. The rod carries an adjustable head or stop 58 at one end beyond the lug 20 and adjustable stops or collars 59 and 60, between the lugsin the path of the crosshead 24. 61 is a bent rod or catch-device pivoted upon the upper end of the lug 20 and having a horizontally-extending arm formed near its end with a hook or shoulder 62 for engaging the lever 44, and a downrwardlyextending arm 63 projecting into the path of the stop 58. When the handle 44 is moved to the stop 56 the catch drops to engage and hold the handle in that position, as indicated in Fig. 7, which starts the work carrier in the direction to the right in Fig. 1. As the crosshead nears the limit of its movement in that direction, it engages the stop 60 and slides 48 to reverse the valves 31, 32. and the move-' ment of the piston 49,which latter is then forced to the left, to the position shown in Fig. 3, where itv stops. In the movement of the carrier to the, right, the knife-blade 53 is held out. of contact with the grinding-wheel 12 and is moved into contact with the latter during the final movement of the parts in that direction, whereby the grinding is performedin the outwardmovement of the parts which isin a directionto-the left in Fig. 1.

As'before stated, the plate 14 is pivotedat 15. Resting on the upper surface of the plate 14 and pivoted at one end upon a. pin 64 carried by thev plate 14, is a lever 65 provided in its swingin j end-portion with an elongated segmental s 0t 66 engaging a pin 67 fastened to and rising, through an opening in the bed 14, from a bracket 68 adjustably secured to the side of the base 11, as by a screwbolt 69, to adapt itv to be shifted with its pin 67 transversely of the bed 14. The lever is pivotally connected at one end to a. projection 7 O on the adjacent endof the rod 57. In the movement of the said rod 57 to the left in the figures, for the purpose of reversing the movement of the carrier as described, it forces the lever 65 to the position shown in Fig. 1 with the effect of swinging the plate 14 on its pivot to move the knife-blade 53 out of contact with the grinding-wheel asindicated.

As the carrier nears the limit of its movement to the right, itiforces the rod 57, by con-tact therewith of the cross-head 24, to the position shown in Fig; 9 and; draws the lever-65., whereby the engagement of the slot 6.6.with the pin 67 swings the plate 14 to press the knife-blade into contact with the grinding face of the grinding-wheel. Thus, when the knife-blade is inserted in the carrier it is moved inward nearly to the limit in that direction out of contact with the grindingwheel, then pressed into engagement with the grinding-wheel, and during its movement in the outward direction remains pressed against the grinding-wheel to permit the grinding operation to be performed.

The motive fluid I prefer to employ is water which escapes from the faucets 37,42 through an opening 71 in the base-plate 14 into the basin in which the grinding-wheel The speed of movement of the piston 49 in either direction is-controlled by therotates.

. each operation to move at maximum in the inward direction, and at comparatively slow speed in the outward direction while the grinding is being performed. The best results in grinding knife-blades, for example, are obtained by grinding in but one direction and moving the work at a certain speed with reference to the speed of rotation of the grinding-wheel.

My improvements permit the movements of the 'carrier to be readily controlled to effect the best results.

The pipes 36, 41, and valvechamber 28 also operate to hold the heads 25, 26 in fixed. relation to each other, thereby dispensing with the use of tie-rods.

What I claim as new and desire to secure by Letters Patent is 1. In a grinding machine, the combination with a stationary frame and a grindingwheel, of a swinging bed pivoted to the frame, a workholder on the bed, a motor for reciprocating the work-holder, reversing means on the bed for the motor, and mechanism in the path of movement of said reversing means for swinging the bed with reference to the grinding-wheel.

2. In a grinding-machine, the combination with a stationary frame and a grindingwheel, of a swinging bed pivoted to the frame, a work-holder on the bed, a motor for reciprocating the work holder, reversing means on the bed for the motor, and mechanism for swinging the bed with reference to the grinding-wheel comprising a lever pivoted to said bed and slidably connected with said frame, and operating means for the lever 1n the path of sald reversing means.

3. In a gr1nd1ng-1nach1ne, the combination with a stationary frame and a' grindingwheel journaled therein, of a bed pivoted at one end to the base, a work-holder and cylinder on the bed, a piston in said cylinder connected with said work-holder for reciprocating the same, and means for oscillating the bed, comprising a swinging lever having a segmental slot in its swinging end and pivoted to the bed of the machine, and a pin on said base engaging said slot, said lever being operatively connected at its slotted end with said work-carrier for the purpose set forth. I

4. In a grinding-machine, the combination with a stationary frame and a grindingwheel, of a swinging bed pivoted to the frame, a work-holder on the bed, a motor for reciprocating the work-holder, reversing means on the bed for the motor, and mechanism for swinging the bed with reference to the grinding-wheel, comprising a rod, a lever connected with said rod and pivoted to the bed and slidably connected with said frame, and tappets on said rod in the path of said reversmg me ans.

5. In a grinding-machine, the combination with a stationary frame and a grindingwheel, of a swinging bed pivoted to the frame, a work-holder on the bed, a motor for reciprocating the work-holder, an operating lever constructed and arranged to control the forward and reverse operation of the motor, a spring controlling said lever, a second lever fulcrumed on a support and provided at oneend with a catch for releasably holding said operating lever against the tension of said spring, and mechanism for swinging the bed with reference to the grinding-Wheel, comprising a rod, a third lever connected with said rod and pivoted to the bed and slidably connected with said frame, tappets on said rod adapted to be engaged by said workholder in its travel in opposite directions to shift the rod, and a third tappet on said rod into the path of which an arm of said second lever extends, for the purpose set forth.

6. In a cutlery grinding-machine, the combination with a base and a grinding-wheel journaled thereon, of a work-holder, a cylinder, a piston in said cylinder connected with said work-holder for reciprocating the latter, and means for actuating the piston by fluidpressure comprising a spring-controlled valve for controlling the pressure-supply to said cylinder, an operating lever for actuating said valve, catch-mechanism adapted to engage said lever to releasably hold it and said valve against the tension of the spring, and means actuated by the work-holder for disengaging said lever from the catch-mechanism and cause said lever to return with the valve to their normal positions at the end of the inward stroke of the piston.

7. In a cutlery grinding-machine, the combination with a base and a grinding-wheel journaled thereon, of a work-holder, a cylinder, a piston in said cylinder connected with said work-holder for reciprocating the latter, and means for actuating the piston by fluidpressure comprising a spring-controlledvalve for controlling the pressure-supply to said cylinder, catch mechanism for releasably maintaining said valve in one position against the tension of its spring, and means actuated by said work-holder for engaging said catch to free the valve and allow it to return under the action of its spring to-normal position.

8. In a cutlery grinding-machine, the combination with a base and a grinding-wheel journaled thereon, of a work-holder, a cylinder, a piston in said cylinder connected with said work-holder for reciprocating the latter, and means for actuating the piston by fluid-pressure comprising a spring-controlled valve for controlling the pressuresupply to said cylinder, a lever fulcrunied at one end to a support and pivotally fastened between its ends to saidvalve for moving the latter against the resistance of its said spring, a second lever fulcrumed on the machine and having a catch normally in the path of the lever by which said lever is releasably held in shifted position, and means movable with said Work-holder for engaging said second lever to move the catch and release the first lever to permit it'and the valve to be returned by the spring totheir normal positions.

9. In a cutlery grinding-machine, the combination with a base and a grinding-wheel journaled thereon, of a Work-holder, a cylinder, a piston in said cylinder connected with said work-holder for reciprocating the latter, and means for actuating the piston by fluidpressure comprising a spring-controlled valve for controlling the pressure-supply to said cylinder, an operating lever for actuating said valve, a bell-crank lever fulcrumed on the machine and provided at one end with a catch adapted to be engaged by said operating lever to releasably hold the latter and said valve against the tension of the valvespring, and means actuated by the Workholder for disengaging said lever from said catch to cause said lever and the valve to return to their normal positions.

' JOHN G. BLESSING. V

In the presence of J. H. LANDEs, C. W. WASHBURNE. 

